Grinding-mill.



T. U. CADWGAN..

GRINDING MILL. APPLIOATION PIL'BD NOV. 22, 1906.

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GRINDING MILL.

APPLICATION FILED NOV. 22, 1905.

926, 1 68., Patented June 29, 1909.

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GRINDING MILL.

APPLICATION I'ILED NOV. 22, 1905.

926,1 68. Patented June 29, 1909.

- 3 SHEETS-SHEET 3.

)Vihmoom THOMAS C. GADWGAN, OF SPRINGFIELD, OIIIO.

GRINDING-MILL.

Specification of Letters Patent.

Patented June 29, 1909.

Application filed November 22, 1905. Serial No. 288,529.

To all whom it may concern:

Be it known that I, THOMAS C. Oxnwoax, a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Grinding-Mills, of which the following is a specification.

My invention relates to improvements in grinding mills and is particularly adapted to grind in addition to various small grains, corn on the cob and cotton seed.

The object of the invention is to provide a mill which will be simple, cheap and durable, and in which the various parts shall be read ily accessible and easily replaced in case of accident.

A further object is to provide in such mills rolls of greater grinding efficiency and longer life.

l/Vith the above primary and other incidental objects in view, the invention consists of the construction, parts and combination thereof, or their equivalents, hereinafter described and set forth in the claims.

In the drawings, Figure 1 is a side elevation of the grinding mill. Fig. 2 is a vertical sectional view. Fig. 3 is a rear view. Fig. i is an end view of one of the grinding rolls. Fig. 5 is a longitudinal sectional view of the grinding rolls. Figs. 6 and 7 are external views of the two rolls constituting a pair. Fig. 8 is an interior perspective view of one of the segmental grinding plates. Fig. 9 is a d etail of one of the units constituting the mangle rolls.

Like parts are indicated by corresponding characters of reference throughout the several views.

In constructing the mill, there are employed side frames a a, having ways, a formed therein for the bearing blocks, 0 c of the grinding rolls. Between the side frames, (1 a, and constituting the front and rear walls of the supporting frame are castings a (t the contour of which somewhat corresponds to the arrangement of grinding rolls located within the chamber thus formed. The structure or supportingframe thus formed is held in position by a plurality of bolt rods extending through the opposite side frames a a and through suitable lugs on the castings, a a. Located upon the supporting frame thus formed is a chamber, (0", within which are located the mangle rolls hereinafter described. Sui-mounting the In the chamber, a, is the usual hopper a structure as illustrated, there is one pair of i'uangle rolls and two pairs of grinding rolls. To avoid the possibility of breakage in case some foreign substance entered the mill, the pair of mangles and each of the respective rolls are separately driven by bolts from the counter shaft, A.

Each of the mangles consists of a shaft Z) upon which are located a plurality of units as shown in Fig. 9. These units consist of a collar portion, l), with which there are formed integral a plurality of teeth 11 The shafts b b are located in such relation that the teeth [F of the respective mangles will overlap, and the units are so arranged upon the shafts f) b that the teeth will alternate, t. 0., the teeth of one mangle will extend between the teeth of the opposite mangle. Further, each successive unit on the shaft is located with its teeth slightly in advance of the preceding unit. To further assist in mangling or tearing the material preparatory to grimling, there is provided a triangular bar, 1)", extending across the machine, having teeth I) on its upper or inclined faces, between which the teeth I) of the respective mangles pass. The mangles are driven from a pulley, b, mounted on a stud extending from the hopper a (see Fig. 23); secured to the pulley If is a pinion I) meshing with a gear 6 on one of the shafts b, at its opposite end said shaft carries a pinion, b meshing with the gear I) on the corresponding mangle shaft 1) as in Fig. 1.

Secured to the castings, o a, are deflectors, b which direct the material as it falls from the inangles to the first pair of grinding rolls.

Inasmuch as the general construction of each of the grinding rolls is the same, a description of one will suffice for all. Referring to Figs. l and 5, it will be seen that each roll consists of a shaft, 0, adapted to be mounted in bearing blocks 0 0*, as in Fig. 1. The shaft, 0, is suitably splined and slidingly mounted thereon are roller heads 0 0 In each of the heads 0 is a series of openings, 0', the outer side of which is preferably inclined or beveled as in Fig. 5. The cylindrical grinding surfaces of the rolls is made up of a plurality of segmental plates, 0 preferably of cast steel. The rolls illustrated are shown as composed of four such segmental plates. It is to be understood, however, that the number may be varied according to the size of the roll. The length of are is such as to permit them to be readily drawn during the casting process. Projecting from the inner side of the plates, 0", are oppositely disposed fingers, 0 preferably wedge-shaped. (See Figs. 5 and 8.) When the segmental plates, 0 are arranged in positiona bout the roller heads, 0 the fingers, c, engage the openings, 0 as in Figs. 4 and 5. Bolts, 0 connect the heads, 0 and upon the tightening of said bolts the engagement of the beveled openings c and the fingers c tend to draw the segmental plates tightly in place. As illustrated in Figs. 6 and 7, the segmental plates of one of the rolls of each pair are formed with comparatively small corrugations or ribs ex tending parallel with the axis of the roll. The corrugations or ribs of the segmental plates of the other roll are arranged angularly with the axis of the roll, and adjacent plates are preferably arranged with their corrugations running in different directions so that the ribs of one plate are in angular relation to the ribs of adjacent plates; that is, the ribs of adjacent sections will extend in different angular directions to the longitudinal axis of the roll so that adjacent ribs of adj a cent sections will form in effect a V.-shape. The result of this construction is that the material being ground will be caused to be fed or moved from end to end of the rolls and back again and thus be kept evenly distributed throughout the length of the rolls and prevented from accumulating at any one point, thus materially increasing the efficiency of the grinding operation. If desired the roll with the angularly-arranged ribs might be cast 1n one integral part instead of being formed in sections as shown.

A roll construction as described may be readily and cheaply made from cast metal, and worn or damaged parts may be easily replaced without the necessity of replacing the entire roll. Further, as the corrugations become worn on one side and the grinding efliciently of the roll becomes impaired, the roll may be slipped from the shaft and reversed, thus causing the opposite side of the corrugations to become the working edge, and the wearing of the corrugations in this reversed position will tend to sharpen the working edge of the corrugation used in the original position, thus adding greatly to the life of the roll.

It is to be understood that the lower or second set of rolls is adjusted to finer grinding than the first or upper set.

Secured to the castings, a a, are deflectors, a to direct the material onto the second set of rolls. The respective rolls of each set are independently driven from the counter shaft A at different peripheral speeds. The power is transmitted from the small pulley, d, to the comparatively large pulley, (Z on one of the roller shafts of the upper pair of rolls, and from the pulley, (Z on said counter iiii nii shaft to a similar pulley, (Z on the other roller shaft. See Fig. 1.) Thelowerpair of rolls are similarly driven on the opposite side of the machine.

The bearing blocks, 0 are stationary in the ways, 60 while the bearing blocks, 0 are movable therein to permit the adjustment of the rolls for fine or coarse grinding. A helical spring, 6, interposed between said bearing blocks tends to keep the rolls se )arated. Screws, 0, provided with adjusting mobs or grips 6 are screw-threaded either into the bearing block, 0 or into intermediate bearing members 6 Each of the screws is provided with a fixed collar on which rests the end of a bow spring 6", these collars being adapted to bear against the plates, a, through which the screws loosely pass.

A bow spring 6 is provided for each set of rolls, the opposite ends of each spring engaging the screws 6 which in turn engage the movable bearing block, 0 of the corresponding pair of rolls. Through an opening near the center of each of the bow springs, 2 eX- tends a screw-threaded stud, e fixed to the casings, a and provided with the adjusting knob 6 adapted to adjust the tension of the spring against the collars 0 By means of the adjusting knob, 6 the relation of the rolls are varied, the pressure being applied equally to each end of the movable rolls. However, by the use of the screws, 6 either end of the movable roll may be independently adjusted to bring the respective rolls into alinement.

Immediately above each of the sets of rolls is located an inverted V-shaped adjustable gate, f, which is pivoted on a rod extending across the machine, and is operated by a knob,f on the outside of the frame, a. The respective wings of the V-shaped gate lie adjacent to the respective rolls of the set, and by adjustment to or from said rolls regulate the amount of material which may pass between the rolls. The gate, f, is so arranged in its relation with the sets of rolls that the bi-sector of the angle formed by the wings of said gate is divergent with the common tangent of said rolls whereby when said gate is oscillated upon its pivotal rod the respective wings will simultaneously move away from or toward the corresponding rolls.

It is obvious that various modifications may be employed in carrying out the invention; therefore, I do not limit myself to the exact construction shown and described.

Having thus described my invention, I claim 1. In a machine as described, a supporting frame, a pair of grinding rolls, one of said rolls being movable with respect to the other, springpressed adjusting means for each end of said movable roll, and a spring tension device for said roll, said springs operating with opposing forces, substantially as specified.

2. In a grinding mill as described, the

aau xuu combination with a pair of grinding rolls, of an adjustable feed gate having angularlyarranged wings, said wings extending to points in proximity to said rolls, said gate being so located in relation to said rolls that upon oscillation each of said wings will simultaneously move away from or toward its corres ending roll, substantially as specified.

3. n a grinding machine as described, the combination with a pair of grinding rolls, of an adjustable feed gate, comprising angularly-arranged integral wings, said gate being so arrangedin relation to said rolls that the bisector of the angle formed by said wings will be divergent with the common tangent ofthe said rolls, substantially as specified.

4. In a machine as described, a pair of opposing grinding rolls, one of said rolls having a plurality of series of ribs or serrations, the ribs or serrations of each series being extended entirely across the rolls in straight parallel lines but at an angle to the longitudinal axis of the roll, and the ribs or serrations of adjacent series being arranged at opposite angles to said axis with respect to each other, substantially as specified.

5. "In a machine as described, a )air of opposing grinding rolls, one of said rol s having ribs or serrations parallel with the axis of the roll, the other roll having a plurality of series of ribs or serrations, the ribs or serrations of each series extending entirely across the roll in straight parallel lines but being arranged at an angle to the longitudinal axis of the roll, and the ribs or serrations of adj acent series being arranged at opposite angles to said axis with respect to each other, substantially as and for the purpose specified.

In testimony whereof, I have hereunto set my hand this 17th day of November A. D. 40

THOMAS C. OADWGAN.

Witnesses:

CnAs. I. WELOH, CLARA GALLAGHER. 

